private void ClearQueue()
{
var queued = 0;
AL.GetSource(_source, ALGetSourcei.BuffersQueued, out queued);
AudioDevice.Check();
for (var i = 0; i < queued; i++)
{
AL.SourceUnqueueBuffer(_source);
}
try
{
AudioDevice.Check();
}
catch
{
//unqueueing buffers can fail
}
}
private void Empty()
{
lock (_sync)
{
AL.SourceStop(_alsourceid);
AudioDevice.Check();
AL.GetSource(_alsourceid, ALGetSourcei.BuffersQueued, out int queued);
for (int i = 0; i < queued; i++)
{
AL.SourceUnqueueBuffer(_alsourceid);
AudioDevice.Check();
}
try
{
AudioDevice.Check();
}
catch
{
//unqueueing buffers can fail
}
}
}
private void BufferRefiller()
{
try
{
while (true)
{
ALSourceState state;
lock (_sync)
{
state = AL.GetSourceState(_alsourceid);
if (state == ALSourceState.Playing)
{
RefillProcessed();
}
else if (_needsrefill)
{
AL.SourcePlay(_alsourceid);
AudioDevice.Check();
}
}
if (state == ALSourceState.Playing)
{
Thread.Sleep(1);
}
else
{
_event.WaitOne();
_event.Reset();
}
}
}
catch (AudioException ae)
{
Program.NonFatalError(ae.ToString());
}
}
private bool FillAndAddBuffer(int bufnum)
{
var requestStop = false;
var readsamples = _reader.ReadSamples(_samplebuffer, 0, _samplebuffer.Length);
for (var i = 0; i < readsamples; i++)
{
var temp = (int)(32767f * _samplebuffer[i]);
if (temp > short.MaxValue)
{
temp = short.MaxValue;
}
else if (temp < short.MinValue)
{
temp = short.MinValue;
}
_conversionbuffer[i] = (short)temp;
}
if (_firstbuffer)
{
var earlysamples = Math.Min(_samplebuffer.Length / 20, readsamples);
//10th of a second unless its too much
for (var i = 0; i < earlysamples; i++)
{
var divisor = (20 - (19 * (i / (float)earlysamples)));
if (divisor < 1)
{
divisor = 1;
}
_conversionbuffer[i] /= (short)divisor;
}
_firstbuffer = false;
}
if (readsamples != _samplebuffer.Length)
{
_endbuffers[bufnum] = true;
if (Loop)
{
_reader.DecodedTime = TimeSpan.FromSeconds(0);
// If we previously had no data, try to fill the buffer once again
if (readsamples == 0)
{
return(FillAndAddBuffer(bufnum));
}
}
else
{
requestStop = true;
}
}
if (readsamples != 0)
{
var buffer = _buffers[bufnum];
AL.BufferData(buffer, _format, _conversionbuffer, readsamples * sizeof(short),
_reader.SampleRate);
AudioDevice.Check();
AL.SourceQueueBuffer(_source, buffer);
AudioDevice.Check();
}
return(requestStop);
}
private void DataStreamProc()
{
//based on a couple of different audio library playback methods. most notably sfml here.
try
{
var requeststop = false;
lock (_threadlock)
{
if (_threadstartstate == Status.Stopped)
{
_streaming = false;
_continue = true;
return;
}
}
AudioDevice.Check();
_buffers = AL.GenBuffers(BufferCount);
for (var i = 0; i < BufferCount; i++)
{
_endbuffers[i] = false;
}
_firstbuffer = true;
requeststop = FillQueue();
bool requirefirstplay = requeststop;
_continue = true;
AudioDevice.Check();
lock (_threadlock)
{
if (_threadstartstate == Status.Paused)
{
AL.SourcePause(_source);
AudioDevice.Check();
}
}
for (;;)
{
lock (_threadlock)
{
if (!_streaming)
{
break;
}
}
if (GetStatus() == Status.Stopped)
{
if (!requeststop || requirefirstplay)
{
requirefirstplay = false;
AL.Source(_source, ALSourcef.Pitch, _pitch);
AL.SourcePlay(_source);
}
else
{
lock (_threadlock)
{
_streaming = false;
}
}
}
var processed = 0;
AL.GetSource(_source, ALGetSourcei.BuffersProcessed, out processed);
AudioDevice.Check();
while (processed-- != 0)
{
var buffer = AL.SourceUnqueueBuffer(_source);
AudioDevice.Check();
var buffernum = 0;
for (var i = 0; i < BufferCount; i++)
{
if (_buffers[i] == buffer)
{
buffernum = i;
break;
}
}
if (_endbuffers[buffernum])
{
_reader.DecodedTime = new TimeSpan(0);
_endbuffers[buffernum] = false;
}
else
{
int size, bits;
AL.GetBuffer(buffer, ALGetBufferi.Size, out size);
AL.GetBuffer(buffer, ALGetBufferi.Bits, out bits);
if (bits == 0)
{
lock (_threadlock)
{
_streaming = false;
requeststop = true;
Program.NonFatalError(
"bits in sound stream are 0. Corrupt audio format?");
break;
}
}
}
if (!requeststop)
{
if (FillAndAddBuffer(buffernum))
{
requeststop = true;
}
}
}
if (GetStatus() != Status.Stopped)
{
Thread.Sleep(10);
}
}
AL.SourceStop(_source);
ClearQueue();
AL.Source(_source, ALSourcei.Buffer, 0);
AL.DeleteBuffers(_buffers);
}
catch (AudioDeviceException) //audiodevice disposed
{
}
Playing = false;
}
